I live in the Northwest, and T-Mobile has great coverage in the cities, and along the interstates. Sprint has some additional coverage on smaller state highways, but neither really cover 'the mountains', or the coat, or other rural areas much. I wish I could take this up, since my 4 unlimited Verizon lines cost $45/line, that is $720/year in savings...

edit, nevermind, no tethering with the $30 plan. So it would be the same cost as my Verizon plan.